4Home taking payment for product they don't have. Refund could be up to 60 days

I ordered a Salton Flat grille online and got confirmation of the order and paid for it via EFT on the 16 September. I have been waiting for the order and 4Home kept sending me emails that my order is on its way. on 29 September I enquired on their chat platform and they told me the grille is not available and they will send me a refund form. Why did they process the order if the product is not available, why did they not inform me immediately they realised this? Are they keeping the money in their account to get the bank interest then refund (others refund withing 5 days)? I have filled in the refund form and they are now telling me it will take between 10 to 60 days to reflect. So almost a month of no product and no refund. The customer care lady was not helpful either as she kept telling me about Ts&Cs while the company is at fault. Worst online experience, would have been better if they treating this as a once off and processed my refund quicker.